1 /* 2 * Copryight 1997 Sean Eric Fagan 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by Sean Eric Fagan 15 * 4. Neither the name of the author may be used to endorse or promote 16 * products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 static const char rcsid[] = 34 "$FreeBSD: src/usr.bin/truss/syscalls.c,v 1.10.2.6 2003/04/14 18:24:38 mdodd Exp $"; 35 #endif /* not lint */ 36 37 /* 38 * This file has routines used to print out system calls and their 39 * arguments. 40 */ 41 42 #include <sys/types.h> 43 #include <sys/socket.h> 44 #include <sys/un.h> 45 #include <netinet/in.h> 46 #include <arpa/inet.h> 47 48 #include <ctype.h> 49 #include <err.h> 50 #include <signal.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 #include "syscall.h" 58 59 /* 60 * This should probably be in its own file. 61 */ 62 63 struct syscall syscalls[] = { 64 { "readlink", 1, 3, 65 { { String, 0 } , { String | OUT, 1 }, { Int, 2 }}}, 66 { "lseek", 2, 3, 67 { { Int, 0 }, {Quad, 2 }, { Int, 4 }}}, 68 { "mmap", 2, 6, 69 { { Hex, 0 }, {Int, 1}, {Hex, 2}, {Hex, 3}, {Int, 4}, {Quad, 6}}}, 70 { "open", 1, 3, 71 { { String | IN, 0} , { Hex, 1}, {Octal, 2}}}, 72 { "linux_open", 1, 3, 73 { { String, 0 }, { Hex, 1}, { Octal, 2 }}}, 74 { "close", 1, 1, { { Int, 0 } } }, 75 { "fstat", 1, 2, 76 { { Int, 0}, {Ptr | OUT , 1 }}}, 77 { "stat", 1, 2, 78 { { String | IN, 0 }, { Ptr | OUT, 1 }}}, 79 { "lstat", 1, 2, 80 { { String | IN, 0 }, { Ptr | OUT, 1 }}}, 81 { "linux_newstat", 1, 2, 82 { { String | IN, 0 }, { Ptr | OUT, 1 }}}, 83 { "linux_newfstat", 1, 2, 84 { { Int, 0 }, { Ptr | OUT, 1 }}}, 85 { "write", 1, 3, 86 { { Int, 0}, { Ptr | IN, 1 }, { Int, 2 }}}, 87 { "ioctl", 1, 3, 88 { { Int, 0}, { Ioctl, 1 }, { Hex, 2 }}}, 89 { "break", 1, 1, { { Hex, 0 }}}, 90 { "exit", 0, 1, { { Hex, 0 }}}, 91 { "access", 1, 2, { { String | IN, 0 }, { Int, 1 }}}, 92 { "sigaction", 1, 3, 93 { { Signal, 0 }, { Ptr | IN, 1 }, { Ptr | OUT, 2 }}}, 94 { "accept", 1, 3, 95 { { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } }, 96 { "bind", 1, 3, 97 { { Hex, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } }, 98 { "connect", 1, 3, 99 { { Hex, 0 }, { Sockaddr | IN, 1 }, { Int, 2 } } }, 100 { "getpeername", 1, 3, 101 { { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } }, 102 { "getsockname", 1, 3, 103 { { Hex, 0 }, { Sockaddr | OUT, 1 }, { Ptr | OUT, 2 } } }, 104 { 0, 0, 0, { { 0, 0 }}}, 105 }; 106 107 /* 108 * If/when the list gets big, it might be desirable to do it 109 * as a hash table or binary search. 110 */ 111 112 struct syscall * 113 get_syscall(const char *name) { 114 struct syscall *sc = syscalls; 115 116 while (sc->name) { 117 if (!strcmp(name, sc->name)) 118 return sc; 119 sc++; 120 } 121 return NULL; 122 } 123 124 /* 125 * get_struct 126 * 127 * Copy a fixed amount of bytes from the process. 128 */ 129 130 static int 131 get_struct(int procfd, void *offset, void *buf, int len) { 132 char *pos; 133 FILE *p; 134 int c, fd; 135 136 if ((fd = dup(procfd)) == -1) 137 err(1, "dup"); 138 if ((p = fdopen(fd, "r")) == NULL) 139 err(1, "fdopen"); 140 fseeko(p, (uintptr_t)offset, SEEK_SET); 141 for (pos = (char *)buf; len--; pos++) { 142 if ((c = fgetc(p)) == EOF) 143 return -1; 144 *pos = c; 145 } 146 fclose(p); 147 return 0; 148 } 149 150 /* 151 * get_string 152 * Copy a string from the process. Note that it is 153 * expected to be a C string, but if max is set, it will 154 * only get that much. 155 */ 156 157 char * 158 get_string(int procfd, void *offset, int max) { 159 char *buf; 160 int size, len, c, fd; 161 FILE *p; 162 163 if ((fd = dup(procfd)) == -1) 164 err(1, "dup"); 165 if ((p = fdopen(fd, "r")) == NULL) 166 err(1, "fdopen"); 167 buf = malloc( size = (max ? max : 64 ) ); 168 len = 0; 169 buf[0] = 0; 170 fseeko(p, (uintptr_t)offset, SEEK_SET); 171 while ((c = fgetc(p)) != EOF) { 172 buf[len++] = c; 173 if (c == 0 || len == max) { 174 buf[len] = 0; 175 break; 176 } 177 if (len == size) { 178 char *tmp; 179 tmp = realloc(buf, size+64); 180 if (tmp == NULL) { 181 buf[len] = 0; 182 fclose(p); 183 return buf; 184 } 185 size += 64; 186 buf = tmp; 187 } 188 } 189 fclose(p); 190 return buf; 191 } 192 193 194 /* 195 * Gag. This is really unportable. Multiplication is more portable. 196 * But slower, from the code I saw. 197 */ 198 199 static long long 200 make_quad(unsigned long p1, unsigned long p2) { 201 union { 202 long long ll; 203 unsigned long l[2]; 204 } t; 205 t.l[0] = p1; 206 t.l[1] = p2; 207 return t.ll; 208 } 209 210 211 /* 212 * print_arg 213 * Converts a syscall argument into a string. Said string is 214 * allocated via malloc(), so needs to be free()'d. The file 215 * descriptor is for the process' memory (via /proc), and is used 216 * to get any data (where the argument is a pointer). sc is 217 * a pointer to the syscall description (see above); args is 218 * an array of all of the system call arguments. 219 */ 220 221 char * 222 print_arg(int fd, struct syscall_args *sc, unsigned long *args) { 223 char *tmp = NULL; 224 switch (sc->type & ARG_MASK) { 225 case Hex: 226 tmp = malloc(12); 227 sprintf(tmp, "0x%lx", args[sc->offset]); 228 break; 229 case Octal: 230 tmp = malloc(13); 231 sprintf(tmp, "0%lo", args[sc->offset]); 232 break; 233 case Int: 234 tmp = malloc(12); 235 sprintf(tmp, "%ld", args[sc->offset]); 236 break; 237 case String: 238 { 239 char *tmp2; 240 tmp2 = get_string(fd, (void*)args[sc->offset], 0); 241 tmp = malloc(strlen(tmp2) + 3); 242 sprintf(tmp, "\"%s\"", tmp2); 243 free(tmp2); 244 } 245 break; 246 case Quad: 247 { 248 unsigned long long t; 249 unsigned long l1, l2; 250 l1 = args[sc->offset]; 251 l2 = args[sc->offset+1]; 252 t = make_quad(l1, l2); 253 tmp = malloc(24); 254 sprintf(tmp, "0x%qx", t); 255 break; 256 } 257 case Ptr: 258 tmp = malloc(12); 259 sprintf(tmp, "0x%lx", args[sc->offset]); 260 break; 261 case Ioctl: 262 { 263 const char *temp = ioctlname(args[sc->offset]); 264 if (temp) 265 tmp = strdup(temp); 266 else { 267 tmp = malloc(12); 268 sprintf(tmp, "0x%lx", args[sc->offset]); 269 } 270 } 271 break; 272 case Signal: 273 { 274 long sig; 275 276 sig = args[sc->offset]; 277 tmp = malloc(12); 278 if (sig > 0 && sig < NSIG) { 279 int i; 280 sprintf(tmp, "sig%s", sys_signame[sig]); 281 for (i = 0; tmp[i] != '\0'; ++i) 282 tmp[i] = toupper(tmp[i]); 283 } else { 284 sprintf(tmp, "%ld", sig); 285 } 286 } 287 break; 288 case Sockaddr: 289 { 290 struct sockaddr_storage ss; 291 char addr[64]; 292 struct sockaddr_in *lsin; 293 struct sockaddr_in6 *lsin6; 294 struct sockaddr_un *sun; 295 struct sockaddr *sa; 296 char *p; 297 u_char *q; 298 int i; 299 300 /* yuck: get ss_len */ 301 if (get_struct(fd, (void *)args[sc->offset], (void *)&ss, 302 sizeof(ss.ss_len) + sizeof(ss.ss_family)) == -1) 303 err(1, "get_struct %p", (void *)args[sc->offset]); 304 /* sockaddr_un never have the length filled in! */ 305 if (ss.ss_family == AF_UNIX) { 306 if (get_struct(fd, (void *)args[sc->offset], (void *)&ss, 307 sizeof(*sun)) 308 == -1) 309 err(2, "get_struct %p", (void *)args[sc->offset]); 310 } else { 311 if (get_struct(fd, (void *)args[sc->offset], (void *)&ss, 312 ss.ss_len < sizeof(ss) ? ss.ss_len : sizeof(ss)) 313 == -1) 314 err(2, "get_struct %p", (void *)args[sc->offset]); 315 } 316 317 switch (ss.ss_family) { 318 case AF_INET: 319 lsin = (struct sockaddr_in *)&ss; 320 inet_ntop(AF_INET, &lsin->sin_addr, addr, sizeof addr); 321 asprintf(&tmp, "{ AF_INET %s:%d }", addr, htons(lsin->sin_port)); 322 break; 323 case AF_INET6: 324 lsin6 = (struct sockaddr_in6 *)&ss; 325 inet_ntop(AF_INET6, &lsin6->sin6_addr, addr, sizeof addr); 326 asprintf(&tmp, "{ AF_INET6 [%s]:%d }", addr, htons(lsin6->sin6_port)); 327 break; 328 case AF_UNIX: 329 sun = (struct sockaddr_un *)&ss; 330 asprintf(&tmp, "{ AF_UNIX \"%s\" }", sun->sun_path); 331 break; 332 default: 333 sa = (struct sockaddr *)&ss; 334 asprintf(&tmp, "{ sa_len = %d, sa_family = %d, sa_data = {%n%*s } }", 335 (int)sa->sa_len, (int)sa->sa_family, &i, 336 6 * (int)(sa->sa_len - ((char *)&sa->sa_data - (char *)sa)), ""); 337 if (tmp != NULL) { 338 p = tmp + i; 339 for (q = (u_char *)&sa->sa_data; q < (u_char *)sa + sa->sa_len; q++) 340 p += sprintf(p, " %#02x,", *q); 341 } 342 } 343 } 344 break; 345 } 346 return tmp; 347 } 348 349 /* 350 * print_syscall 351 * Print (to outfile) the system call and its arguments. Note that 352 * nargs is the number of arguments (not the number of words; this is 353 * potentially confusing, I know). 354 */ 355 356 void 357 print_syscall(FILE *outfile, const char *name, int nargs, char **s_args) { 358 int i; 359 int len = 0; 360 len += fprintf(outfile, "%s(", name); 361 for (i = 0; i < nargs; i++) { 362 if (s_args[i]) 363 len += fprintf(outfile, "%s", s_args[i]); 364 else 365 len += fprintf(outfile, "<missing argument>"); 366 len += fprintf(outfile, "%s", i < (nargs - 1) ? "," : ""); 367 } 368 len += fprintf(outfile, ")"); 369 for (i = 0; i < 6 - (len / 8); i++) 370 fprintf(outfile, "\t"); 371 } 372 373 void 374 print_syscall_ret(FILE *outfile, const char *name, int nargs, char **s_args, int errorp, int retval) { 375 print_syscall(outfile, name, nargs, s_args); 376 if (errorp) { 377 fprintf(outfile, " ERR#%d '%s'\n", retval, strerror(retval)); 378 } else { 379 fprintf(outfile, " = %d (0x%x)\n", retval, retval); 380 } 381 } 382